We've observed what could be described as 'whisker's' on one lot some time ago...after evaluation we determined it to be caused by inadequate cleaning prior to the immersion bath. We really are not concerned about whiskers. A big difference is in the grain structure which is very uniform and closely bonded in comparison to 'plain old tin' plating which has a loose, course grain structure...what this leads to is a flat surface that does not attract or retain contaminates like the 'old' tin baths... Franklin --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------